The Schumacher Electric 6V/12V 225A ProSeries Manual Battery Charger/Engine Starter, No. DSR139, is built from heavy duty construction for strong starting power. The wheel charger features a 135 minute manual timer for precision control, large professional metal clamps for a solid connection, 6-gauge output cables that stay flexible even in cold weather, and a convenient 12' total cord reach. The DSR139 also features a 225A engine start, 50A boost, 10A charge, and an extra 25A boost mode for both 6V or 12V batteries.